Street Racing Cars For Sale

I remember reading that this is what George Hurst started with, and was so successful that he started branching out. "When he made Almquist's acquaintance, Hurst and Campbell were working out of a garage outside Philadelphia in Abington, with engine mounts as their lead product" http://www.hemmings.com/mus/stories/2006/09/01/hmn_feature10.html

Also see the most clever one I'd come across: http://justacarguy.blogspot.com/2006/11/very-cool-hurst-ad-great-concept.html